iPhone-App Doesn't play 3GP Video After Apple Update

I have a problem with my iPhone app. I will try my best to describe it.

1. I have an iPhone app that can display a web page.
2. This webpage has a link to a 3GP video.
3. Clicking on this link will open the video and play it.

This was working for a long time, but after a recent Apple Update, i got the message:

"Can't play this file"

开发者_如何转开发

Here is a Firefox screenshot from the file.

Does anyone have a suggestion as to what could have changed?

Thanks!

edit: added Screenshot

See this SO answer: iPhone UIWebview video playback 4.0

The answer (and its comment) is about MIME type settings of the server. If the MIME types are not set correctly by the webserver, the playback might fail.